Ancient deity, pet and endangered species. Why is axolotl Mexico's most beloved amphibian?

"It's an interesting little animal," said Yanet Cruz, head of the Chinampaxóchitl Museum in Mexico City.

Its exhibitions focus on axolotl and chinampas, the pre-Hispanic agricultural systems resembling floating gardens that still function in Xochimilco, a neighborhood on Mexico City's outskirts famed for its canals.

"Despite there being many varieties, the axolotl from the area is a symbol of identity for the native people," said Cruz, who participated in activities hosted at the museum to celebrate Axolotl Day in early February.

The species Ambystoma mexicanum — endemic of central Mexico— has been catalogued as "critically endangered" by the IUCN Red List of Threatened Species since 2019. Though biologists, historians and officials led efforts to save the species and its habitat from extinction, a parallel, unexpected preservation phenomenon emerged.

Axolotl attracted international attention after Minecraft added them to its game in 2021 and Mexicans went crazy about them that same year, following the Central Bank's initiative to print it on the 50-peso bill.

"That's when the 'axolotlmania' thrived," Cruz said.

All over Mexico, the peculiar, dragon-like amphibian can be spotted in murals, crafts and socks. Bakeries caused a sensation with axolotl-like bites. Even a brewery — "Ajolote" in Spanish — took its name from the salamander to honor Mexican traditions.

The axolotl appeared in ancient Mesoamerican documents. In the Nahua myth of the Fifth Sun, pre-Hispanic god Nanahuatzin threw himself into a fire, reemerged as the sun and commanded fellow gods to replicate his sacrifice to bring movement to the world. All complied but Xólotl, a deity associated with the evening star, who fled.

"He was hunted down and killed," said Arturo Montero, archeologist of the National Commission of Protected Natural Areas. "And from his death came a creature: axolotl."

According to Montero, the myth implies that, after a god's passing, its essence gets imprisoned in a mundane creature, subject to the cycles of life and death. Axolotl then carries within itself the Xolotl deity, and when the animal dies and its divine substance transits to the underworld, it later resurfaces to the earth and a new axolotl is born.

Fascination toward axolotl was most likely sparked by its exceptional biological features, Montero said.

Through the glass of a fish tank, where academic institutions preserve them and hatcheries put them up for sale, axolotl are hard to spot. Their skin is usually dark to mimic stones — though an albino, pinkish variety can be bred — and they can stay still for hours, buried in the muddy ground of their natural habitats or barely moving at the bottom of their tanks in captivity.

They breathe through their gills and skin, which allows them to adapt to its aquatic environment. They can regenerate parts of their heart, spinal cord and brain.

"This species is quite peculiar," said biologist Arturo Vergara, who supervises axolotl preservation efforts in various institutions and cares after specimens for sale at a hatchery in Mexico City.

Depending on the species, color and size, Axolotl's prices at Ambystomania — where Vergara works — start at 200 pesos, or $10 in U.S. currency. Specimens are available for sale when they reach 4 inches in length and are easy pets to look after, Vergara said.

"While they regularly have a 15-years life span (in captivity), we've had animals that have lived up to 20," he added. "They are very long-lived, though in their natural habitat they probably wouldn't last more than three or four years."

The species on display at the museum — one of 17 known varieties in Mexico — is native to lakes and canals that are polluted, where axolotl now would likely struggle to feed or reproduce.

Under ideal conditions, an axolotl could heal itself from snake or heron bites and survive the dry season buried in the mud. But a proper aquatic environment is needed for that to happen.

"Efforts to preserve axolotl go hand in hand with preserving the chinampas," Cruz said at the museum, next to a display featuring salamander-shaped dolls. "We work closely with the community to convince them that this is an important space."

Chinampas are not only where axolotl lay their eggs, but areas where pre-Hispanic communities grew maize, chili, beans and zucchini. Some residents still grow vegetables in Xochimilco's chinampas despite environmental threats.

"This great system (chinampas) is all that's left from the lake city of Mexico-Tenochtitlan, so I always tell our visitors that Xochimilco is a living archeological zone," Cruz said. "If we, as citizens, don't take care of what's ours, it will be lost."